Hal Communications CWR6850, Инструкция по эксплуатации

Страница: 30 / 64

CHAPTER 4 PAGE 30
As discussed in section 4.3, a CW identification feature is included in the CWR6850. Current U.S.
amateur RTTY regulations (and those of most other countries) require the transmission of the sta-
tion call letters in Morse code before and after each major transmission. The CW ID can be con-
veniently included in the program for the HERE IS 0 memory. The following procedure is recom-
mended for use in formatting a typical amateur RTTY exchange:
WQ9XYZ (your station) conversing with WQ6ZZZ:
Program HERE IS #0 for: "CR CR LF DE WQ9XYZ DE WQ9XYZ CR CR LF"
Program HERE IS #1 for: "WQ6ZZZ DE WQ9XYZ" (see section 4.3 for programming)
Typical transmission:
"CTRL-R:0" (call HERE IS #0)
"CTRL-R:1" (call HERE IS #1)
"CR CR LF GOOD MORNING, DAVE. HOW ARE YOU TODAY? ..........
..........(text) .................(text) .................. ..........(text) .................(text)
.......... SO, BACK TO YOU, DAVE.
"CTRL-R:1" (call HERE IS #0)
"CTRL-R:0" (call HERE IS #1)
Notice that the "CR CR LF" carriage control characters and both a RTTY and CW ID are included in
the HERE IS #0 program; one call to HERE IS #0 satisfies the stations ID requirement. As men-
tioned in section 4.3, a message such as "CW ID FOLLOWS" is not included since it is not neces-
sary; the "CR CR LF" sequences "isolate" the CW ID section, preventing garbled overprint at the
other station.
Baudot RTTY may be transmitted and received in several formats with the CWR6850. Two different
demodulator/modulator audio tone sets may be used as explained in Sections 3.3 and 3.4. The
transmit tones match the receive demodulator filters to assure true transceive frequency matching.
These same tones may also be used to record and play back messages with an audio tape record-
er as explained in Section 5.4. Simultaneous with the selected transmit tone output, the data is al-
so available to the SW OUT - FSK connector. The NOR/REV switch effects ONLY the receive de-
modulator and does not reverse the mark-space sense of the tone frequencies; mark is always the
lower audio frequency transmitted.
The KOS (Keyboard Operated Switch) feature is very convenient for RTTY operation of an amateur
station. The KOS circuit functions much the same as a VOX - voice controlled break-in - circuit of a
SSB transmitter, automatically controlling the transmit-receive switching of the station. To use KOS,
select the AUTO switch position and start typing your message. When you are ready to start trans-
mitting, use the "CTRL-A" command (explained in detail in section 4.2). The SW OUT - REMOTE
transistor will turn-on the transmitter and, after a short pause (to let the transmitter, amplifier, and
antenna relays settle), the first of the typed text will start transmitting. When all of the text has
been transmitted, the KOS turns off the transmitter and you may receive. The "CTRL-X" command
may also be used for semi-automatic control.
4.6 Special Considerations When Transmitting ASCII
ASCII RTTY code may be transmitted with the CWR6850 by selecting the RTTY and ASCII switch
positions. ASCII may be transmitted or received at any of the data rates, 45 baud through 300
baud. Current U.S. amateur FCC regulations do not stipulate specific ASCII data rates that must be
used. However, the following are the maximum data rates that may be used for particular fre-
quency ranges: